Split PDF by Size or Page Count Online

Split a PDF by page count or file size

Need to break a large PDF into smaller, more manageable parts? Choose to split every N pages, or split so each part stays under a target file size — useful for email attachment limits and upload portals. Results download as a convenient ZIP file.

Split by page count

Choose how many pages per output file (e.g. every 5 pages). The last part may have fewer pages. Great for breaking a long document into chapters or sections.

Split by target file size

Each part is built one page at a time until adding another page would exceed the target (500 KB, 1 MB, 2 MB, or 5 MB). This is useful when an upload portal or email system has a per-file size limit.

When to split by size instead of compressing

Use size-based splitting when the receiver or upload portal sets a strict limit per file, but the document still needs to remain readable. Compression can reduce file size, but heavy compression may blur scans, signatures, small tables, and QR codes. Splitting keeps the original page quality and creates several smaller PDFs instead of one over-compressed file.

This is common for job applications, school submissions, insurance claims, government forms, client portals, legal packets, and email systems with attachment caps. If the portal says each attachment must be under 2 MB, choose a target slightly below that limit so the final ZIP and individual PDF parts leave some margin.

How to review the split parts

After downloading the ZIP, open the first part, a middle part, and the final part. Check that page order is continuous, cover pages are not separated from their attachments, and signatures or tables are not split across the wrong context. If a section must stay together, split by page count or use manual page extraction instead of a strict size target.

Rename the output files before sending them if the recipient needs a clear sequence. Names such as "application-part-1", "application-part-2", and "application-part-3" are easier to process than generic downloads. Keep the original full PDF until the recipient confirms that all parts were accepted.

Important limits

File-size splitting is approximate because each PDF page can contain very different image data, fonts, and compression. A scanned photo page may be much heavier than a text page. If one page alone is larger than the target, that part cannot be made smaller by splitting; compress that page or rescan it at a lower resolution first. Also remember that the ZIP file itself can be slightly larger than the sum shown for the individual parts, so leave a little margin below the portal limit and test one upload before sending every part to the final recipient or shared review folder.

Privacy and file safety

Your PDF stays in your browser. Splitting and ZIP creation happen locally on your device. PDF2atom does not upload, store, or analyze your document.

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Frequently asked questions